On 05/31/2011 01:50 AM, Fyodor Ustinov wrote:
Hi!
Fresh 0.28.2 cluster.
Why reading two times slower than the writing by dd, but rados show
different.
(Second question - why rados bench crash on read test?)
root@gate0:/mnt# dd if=/dev/zero of=aaa bs=1024000 count=10000
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 64.5598 s, 159 MB/s
root@gate0:/mnt# dd if=aaa of=/dev/null bs=1024000
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 122.513 s, 83.6 MB/s
root@gate0:/mnt#
Additional. fuse vs kernel mount
fuse:
root@gate0:/mnt# dd if=/dev/zero of=bbb bs=1024000 count=10000
conv=fdatasync
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 75.7654 s, 135 MB/s
root@gate0:/mnt# dd if=bbb of=/dev/null bs=1024000
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 101.613 s, 101 MB/s
kernel:
root@gate0:/mnt# rm bbb
root@gate0:/mnt# dd if=/dev/zero of=bbb bs=1024000 count=10000
conv=fdatasync
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 73.143 s, 140 MB/s
root@gate0:/mnt# dd if=bbb of=/dev/null bs=1024000
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 150.84 s, 67.9 MB/s
root@gate0:/mnt#
What? Ok. reboot. After reboot:
root@gate0:/mnt# rm bbb
root@gate0:/mnt# dd if=/dev/zero of=bbb bs=1024000 count=10000
conv=fdatasync
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 68.9618 s, 148 MB/s
root@gate0:/mnt# dd if=bbb of=/dev/null bs=1024000
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 165.564 s, 61.8 MB/s
root@gate0:/mnt#
Hmm... unmount kernel and mount fuse...
root@gate0:/mnt# cd
root@gate0:~# umount /mnt
root@gate0:~# cfuse -m 10.5.51.230:/ /mnt
** WARNING: Ceph is still under development. Any feedback can be
directed **
** at ceph-devel@xxxxxxxxxxxxxxx or
http://ceph.newdream.net/. **
cfuse[1102]: starting ceph client
cfuse[1102]: starting fuse
root@gate0:~# cd /mnt/
root@gate0:/mnt# dd if=bbb of=/dev/null bs=1024000
10000+0 records in
10000+0 records out
10240000000 bytes (10 GB) copied, 93.076 s, 110 MB/s
root@gate0:/mnt#
What the hell?
WBR,
Fyodor.
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